William cook



(No Model.)

SAW FILING ATTACHMENT.

No. 372,456. Patented Nov. 1, 1887.

WITNESSES; INVENTOR:

. W (%M%fi@ BY Jam wfiw g ATTORNEYS.

UNITE STATES PATENT Urrrcn.

WILLIAM COOK, OF NE? YORK, N. Y.

SAW-FILING ATTACHMENT.

PBCIPICATION forming part of Letters Patent No. 372,456, dated November 1, 1887.

Serial No. 238,988. (No model.)

To aZZ whom it may concern.-

Be it known that l, W'ILLIAM 0001;, of the city, county, and State of New York, have invented a new and Improved Saw-Filing Attachment, of which the following is a full, clear, and exact description.

In filing saws by hand it is almost impossible, even after years of practice, to so hold the file that after sharpening the saw the cuttingedges of all of the teeth willvbe in the same straight line, the difficulty arising from the fact that unless the file be held at the same angle when operating upon each tooth some of the teeth will be lower than others. It is to overcome this difficulty and provide for the holding of the file at the same angle for every tooth filed that I have devised the attachment forming the subject-matter of this application, which consists, essentially, of a graduated plate that is arranged for connection with the tile-point and provided with a gravity-pointer, a thumb-piece being preferably arranged in connection with the plate, all as will be hereinafter more fully described, and specifically pointed out in the claims.

Reference is to be had to theaccompanying drawings, forming a part of this specification,in which similar figures of reference indicate cor-' responding parts in both the views.

Figure 1 is a side view of a file, representing the same as it appears when provided with my saw-filing attachment; and Fig. 2 is a face view of the attachment, representing the same as it appears when removed from the file.

In constructing such an attachment as the one illustrated in the drawings above referred to I provide a plate, 10, upon which there is a graduated scale, 11. To the lower end of this plate I secure a rearwardly-extending boss or projection, 12, which is provided with an upwardly'turned thumb-piece, 13, a triangular opening or aperture, 2, being formed through the plate 10 and through the projection 12. To the face of the plate 10, I connect a pointer, 14, which is formed with a heavilyweighted arm, 15, the pointer being loosely mounted upon a bolt or pin, 16. In forming the aperture 2, I prefer that its vertical defining'wall 3 should be in line with an imaginary line drawn from the central graduation of the scale 11 through the axis of the pin or bolt 16. A set-screw, 4, is arranged as shown in Fig. 2.

In operation the point of the file is inserted in the aperture 2, and the set-screw4 is turned so as to clamp the file to place. The handle of the file is then taken in the right hand, and the thumb of the left hand is placed upon the thumb-piece 13. Then if the file be brought into position to operate upon the sawteeth and the position of the pointer 14 is noted when the correct angle has been obtained,and if this position be maintained as each sawtooth is operated upon, it is apparent that every tooth will be filed at the same angle, and consequently that the points of all of the teeth will be in about the same straight line.

In order to prevent too free swinging of the pointer I prefer to bend. the plate 10 backward just above the boss or projection 12, so that the face of the weighted arm 15 will rest against the face of the plate 10, the frictional contact between the two meeting faces serving to prevent too free a movement of the pointer.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent-- 1. In a saw-filing attachment, the combination, with a graduated plate and a means for connecting said plate to a file, of a gravitypointer arranged in connection with the plate, substantially as described.

2. In a saw-filing attachment, the combinzr tion, with a graduated plate and a means for connecting said plate to the file, of a pointer pi votally connected to the plate,and a weighted arm arranged in connection with the pointer, substantially as described.

3. In a saw-filing attachment, the combination, with a graduated plate having a boss or projection formed thereon, an aperture being formed through the plate and the boss or projection, of a thumb-piece extending to therear of the plate from the boss or projection, and a gravity-pointer pivotally mounted upon the plate, substantially as described.

4. I11 a saw-filing attachment, the combina- 'tion,with a graduated plate, 10, provided with a boss or projection, 12, and bent backward just above said boss, an aperture being formed through the plate and boss, of a gravitypointer mounted upon the plate, a thumbpiece extending backward from the boss or projection, and a set-screw, 4, substantially as Witnesses:

PAUL D. REED, WM. H. Hawks. 

